TIL that the Inca Road system was at least 40,000 kilometres (25,000 mi) long. The roads were carefully planned and maintained. They were paved where necessary, had stairways, bridges and constructions such as retaining walls and a drainage system. Only 25% of the system remains visible today.

TIL that the Inca Road system was at least 40,000 kilometres (25,000 mi) long. The roads were carefully planned and maintained. They were paved where necessary, had stairways, bridges and constructions such as retaining walls and a drainage system. Only 25% of the system remains visible today.

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